Heat evolved.

BITSAT 2015 Papers › Electricity and magnetism questions › Heat evolved.

What amount of heat will be generated in the circuit shown after the switch Sw is shifted from position 1 to position 2?

#Physics #Electricity and magnetism

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21 Answers

66

kaymant ·2009-04-08 21:28:11

@kamalendu, with your correction taken into account and with a sign correction (in the last line in post #3, there should be a plus in front CE₂), your solution is correct. The heat evolved turns out to be \dfrac{1}{2}C\mathcal{E}_2^2. Intersetingly, this heat generated does not depend on \mathcal{E}_1!!

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kamalendu ghosh ·2009-04-09 07:00:43

yes!!

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tapanmast Vora ·2009-04-09 06:58:28

oh okay,

W = QV!!!

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kamalendu ghosh ·2009-04-09 06:55:14

THIS IS WORK DONE BY BATTERY.....W=E1*CE2

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tapanmast Vora ·2009-04-09 06:52:05

FRM WER does this cum : Ce1e2

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kamalendu ghosh ·2009-04-09 06:42:18

final eqn,

0.5(e2-e1)²+Ce1e2-0.5ce1²

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tapanmast Vora ·2009-04-09 06:17:59

if u knoe pl. reply kamlengdu

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tapanmast Vora ·2009-04-09 05:52:16

arre but if the ans is 0.5CE₂² then kahi na kahi to katega hi naa.....

can u pl. write the Final Equation

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kamalendu ghosh ·2009-04-09 05:50:59

@tapan..it does get cancelled.....DO IT CAREFULLY

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tapanmast Vora ·2009-04-09 05:36:02

U_I = 0.5C(E₁-E₂)²

U_F = 0.5C E₁²

wer did CE₁E₂ term get cancelled?????///

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kamalendu ghosh ·2009-04-09 05:18:53

REALLY ...I WAS VERY CASUAL IN SOLVING IT...BASH ME!! SO MANY SILLY ERRORS!!

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kamalendu ghosh ·2009-04-06 19:06:44

hmm...

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kamalendu ghosh ·2009-04-08 05:51:06

check my posts am i right??

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66

kaymant ·2009-04-07 21:09:56

thats not correct sky

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skygirl ·2009-04-07 19:37:08

no comments ? am i right or wrong ?

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skygirl ·2009-04-07 05:54:19

initially wen switch 1 was closed,

charge in the capacitor = q1 = (Îµ₁ - Îµ₂)C

then, when switch 2 is closed,

charge in the capacitor = q2 = - CÎµ₁

net charge flowing through Îµ₁ = C(Îµ₂ - 2Îµ₁)

energy supplied by Îµ₁ = heat produced in the circuit

= CÎµ₁(Îµ₂ - 2Îµ₁)

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kamalendu ghosh ·2009-04-07 04:43:19

ooops!! another mistake....sorry..W=CE1E2....Now I think I am right

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66

kaymant ·2009-04-06 20:00:26

Work done by battery is CE₂?? That is dimensionally wrong.

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kamalendu ghosh ·2009-04-06 19:14:56

am i right??sir??

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kamalendu ghosh ·2009-04-06 19:13:02

theres a mistake in my post U_f=0.5CE₁²
not 0.5CE₂²

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kamalendu ghosh ·2009-04-06 19:11:50

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